package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;
/**
 * @Author dml
 * Date on 2022/6/8 0008
 */


@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info(file.toString());

        String originalFileName = file.getOriginalFilename();
        String suffix = originalFileName.substring(originalFileName.lastIndexOf("."));
        String fileName = UUID.randomUUID().toString() + suffix;

        File dir = new File(basePath);

        if(!dir.exists()){
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath + fileName));
        }catch (IOException e){
            e.printStackTrace();
        }
        return R.success(fileName);
    }
    @GetMapping("/download")
    public void download(String name,HttpServletResponse response){
        try {
            // 输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            // 输出流 写回浏览器 ,展示图片
            ServletOutputStream outputStream = response.getOutputStream();
            // 回来图片类型
            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            // 关闭
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

//        http://localhost:8080/backend/page/demo/upload.html
    }
}
